No, it's certainly not the right forum to say it; and yes, I did read exactly what you wrote. I'm also versed in engineering and can bore everyone to death with technical detail. I chose not to address your suggestion of "forcing" clean air into the tube because it is absurd. To solve the problem of hypoxia a system could be as simple as two tubes (sideways, up, down, left, right, it doesn't matter) and a simple passive one way valve. The dunkee inhales, draws air from one tube and exhales, closing the valve, into the other tube.
We can also talk about the physiological effects of hypoxia and hypercarbia but I think that would be overkill. Hehehehehehehehe.
But we are in agreement, it was a great shoot. Jenya was awesome and so was Chanta as usual. But I'd like to see Chanta on the bottom again.....

I feel I have to respond to sorokahdeen. I don't speak either Russion or French but I do speak anatomy & physiology. Yes, the long tube contains residual CO2. It's what's known as "dead space" in the airway where there's no gas exchange. Adding another tube would actually increase the amount of dead space and increase the amount of CO2 that the dunkee breathes in. Anyone wanting more explanation can email me at RochDom4sub@yahoo.com

Great shoot! You two are awesome as usual. Great enema scene even though it was a bit short! I'd love to see Lena take a couple of quarts of suds over a few minutes. And forced retention. And about a million other things! Something to look forward to. Chanta, if you need a few tips, look no further!

Well, Chanta, if you'd ever like to leave the business and get married and have children then look no further. Hehehe. Actually, you would _have_ to leave the business. But I don't know what the model availability is in Northern, New York......

I must confess that I signed up when I saw that Lena got an enema. I have been a member of the other sites as well and requested such scene play. I'm glad to have finally witnessed it even though it was just a little Fleet. I'm sure it just comes down to receptive the models are in taking them. I'll lay some money down that says that Seven would do it. I'd love to see her take a couple of quarts! Or Cowgirl, or Chanta, or ... all of them! Keep up the good work!